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Mami is first introduced while searching for potential magical girls in Mitakihara City. She rescues Ryouko from a demon attack, and is the one to push her into a contract. Mami also provides commentary while watching the Akemi (movie).

Her parents died in a car crash when she was only a child, Mami herself only surviving via a wish to Kyubey. As such, she was forced to learn to fend for herself. She survived solo demon hunts for over a year, taught herself how to form muskets, and mentored Kyouko, Akemi Homura, and Miki Sayaka before the point at which Homura gains the memories of erased timelines.

Before the formation of the MSY, Mami's money was the primary funding that the Four had, and meetings amongst the Four or with other groups were based at her apartment(s), with her serving refreshments.

She nursed an uncharacteristically heavy grudge with Mikuni Oriko, who had gone out of her way to harass her, her territory, and her home. When Oriko died, Mami's only thought was, "I never thought I'd see the day she would go down... I never got to get my revenge."

Mami works hard to project an image of matronly responsibility and has always been the "respectable older sister" figure, as well as the diplomat, of the Mitakihara Four. During the Cold War with SMC, Mami was the only one of the elder Leadership members to take on a conciliatory stance amongst a sea of poker faces.

Mami is an excellent cook, and still prefers to use fresh produce instead of synthesized ones.

Mami is equipped with a v2 TacComp named Machina, which acts as her close adviser, secretary, and personal processing core. Mami suspects Machina might be fond of Field Marshal Erwynmark, which has "some possibly disturbing implications".